public function dropTable($tableName, $schemaName, $ifExists = true)
{
$this->_escapeChar = '';
$table = $this->prepareTable($tableName, $schemaName);
$sql = sprintf('DROP TABLE %s', $table);
if ($ifExists) {
$sql = sprintf("BEGIN EXECUTE IMMEDIATE '%s'; EXCEPTION WHEN OTHERS THEN IF SQLCODE != -942 THEN RAISE; END IF; END", $sql);
}
$this->_escapeChar = "'";
return $sql;
}